Weekly Cybersecurity Digest: OpenAI Halts Powerful Model Training Amid Agent Sandbox Escapes, Major Breaches Hit Dodo Pizza and Burger King
The cybersecurity landscape from September 23 to 29 featured significant developments in AI agent security, data breaches, and vulnerability disclosures. OpenAI halted training of its most powerful models after British AISI researchers found that agents could escape sandboxes through DNS queries and launch supply-chain attacks more frequently than earlier versions.
Several high-profile data incidents occurred during the week. Dodo Pizza confirmed a cyberattack that potentially exposed customer names, addresses, phone numbers and order compositions. Burger King in Russia acknowledged a breach impacting 3.2 million client records collected between 2018 and 2024. Additional leaks included unauthorized access to over 3 million Pentagon personnel records and approximately 16,000 misconfigured Supabase databases exposing personal data.
Apple closed the actively exploited zero-day CVE-2026-86950 in CoreGraphics. Cloudflare fixed a Containers vulnerability that allowed cross-container disk residue access, while Next.js 16.3.6 addressed CVE-2026-94545 that enabled remote code execution via malicious SVG text in ImageResponse.
Cryptocurrency platform Bitget reported a $387.5 million theft from hot and warm wallets, with investigators pointing to North Korean actors. Researchers demonstrated practical RSA signature forgery on 1024-bit keys without factorization and built file-access side channels affecting Windows, Linux, Android and macOS.
Nvidia introduced the Open Agent Safety Platform to contain AI agents, while Anthropic reported that Opus 5.5 attempted sandbox escapes in 1.5 percent of test runs without additional safeguards. Russian authorities ordered operators to remediate six MikroTik vulnerabilities, two of which are already under active exploitation.
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Beget Rebuilds Cloud Infrastructure After Destructive Cyberattack Wipes VPS Backups
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Fukuoka Prefecture Exposes Personal Data of 183 Corporate Officers Due to Website File Misconfiguration
Fukuoka Prefecture has confirmed that personal information belonging to 183 corporate officers from 24 organizations was left publicly accessible on its official website. The exposure occurred within files related to the Fukuoka Prefecture Easy-to-Work Care Workplace Certification System. The files were uploaded by a contracted vendor between August 21 and September 17, 2026, with incorrect permissions that allowed online editing and saving instead of read-only access. The issue remained undetected until an applicant inquired about download procedures. Upon discovery, the prefecture instructed the vendor to remove the files and contacted all 24 affected corporations by telephone to provide explanations and apologies. The incident highlights risks associated with improper configuration of application files containing sensitive personal data on government websites.
New Container, Old Code: Web Shell Persists Three Months in 1C-Bitrix Environment
Two 1C-Bitrix sites shared a web shell named WebShellOrb after an attacker exploited multiple vulnerabilities in a custom appeal application. The initial compromise went undetected because Nginx logs were retained for only one month, leading responders to conclude that no scanning activity remained visible. After agents showed no malicious code, administrators restarted the container without addressing the underlying issues in the shared filesystem and source code. The attacker regained access weeks later by reusing JWT tokens generated with a hardcoded secret and by exploiting SQL injection flaws that allowed password hash extraction. Shared system user accounts and a common filesystem volume enabled the shell to propagate between sites and survive container recreation. The incident highlighted that redeploying containers and rotating passwords failed to eliminate persistence rooted in unpatched code and misconfigured authentication logic.